Principal Investigator(s):Haan, Mary N., University of California-Davis; Rice, Dorothy P., University of California-Davis; Quesenberry, Charles P., University of California-Davis; Selby, Joseph V., University of California-Davis

Summary:

This data collection is an epidemiological study of chronic disease in the oldest old. It is based on information collected from Kaiser Permanente facilities in Northern California. Members of Kaiser Permanente Medical Care programs who were aged 65 or older at the time the data were being collected and who had taken a multiphasic health checkup examination within four to six years of the baseline date were included in the study. There are several components to the dataset. Part 1, Master Record... (more info)

This data collection is an epidemiological study of chronic disease in the oldest old. It is based on information collected from Kaiser Permanente facilities in Northern California. Members of Kaiser Permanente Medical Care programs who were aged 65 or older at the time the data were being collected and who had taken a multiphasic health checkup examination within four to six years of the baseline date were included in the study. There are several components to the dataset. Part 1, Master Records, includes information from the morbidity review, in which over 35 chronic conditions or diagnoses were
abstracted from the member charts, as well as detailed diagnostic criteria for the major conditions. A prevalence review was done, which included the four years prior to the baseline date for these same conditions. Recurrent disease is included for the following conditions: cancers, myocardial infarction, and various forms of strokes. A detailed account of outpatient health services use, and data from the multiphasic health checkup, which was administered to each participant during the nine yearly follow-ups, are also included in the Master Records file. Part 2, Hospitalization, contains records of causes and dates of hospitalizations and discharges and nursing home admissions. There is also a section on incomplete reviews and the reasons for them. Demographic information and some lifestyle information from the multiphasic health checkup (e.g., smoking, alcohol, and Body Mass Index) are also in this file.

The original documentation from 1995 is included with this collection. This documentation was revised to cover the more recent data files (Master Records and Hospitalization), and additional information was added. The 1995 documentation provides additional context and descriptive information that remains relevant to the users of this data collection. Some variables in the 1995 file were suppressed to protect respondent confidentiality.

In Part 1, for cases that are not recorded as recurring, the incident case is coded as zero when there is a prevalent case.

Methodology

Sample:
Random sample of Kaiser Permanente health insurance members aged 65 and over in 1971 and in 1980 who had taken a multiphasic health checkup exam within four to six years of the baseline date. The study was conducted using a retrospective chart review approach, and it covered the years 1971 to 1991. There were two cohorts of people aged 65 and over in 1971 and 1980, respectively, and each cohort was followed for nine years. The sample was drawn so that there were equal numbers of observations in each of six age-sex groups: 65-69, 70-79, and 80 and over for each of the two cohorts. There were 3,006 women and 2,984 men included overall.

Mode of Data Collection:
record abstracts,
on-site questionnaire

Data Source:

Kaiser Permanente HMO member medical charts

Kaiser Permanente multiphasic medical questionnaires

Version(s)

Original ICPSR Release:2005-05-23

Version History:

2011-02-07 The data collection is being updated to include the following file types: SPSS setup files and datasets; SAS setup files and datasets; STATA setup files and datasets; text data files in .txt and .tsv format; and codebooks containing frequencies for both datasets.

2006-03-30 File CB04219-ALL.PDF was removed from any previous datasets and flagged as a study-level file, so that it will accompany all downloads.